fixed repository link in package.json

package.json

@@ -10,7 +10,7 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://git-r3lab.uni.lu/Fractalis/fractal.js"
+    "url": "https://git-r3lab.uni.lu/Fractalis/fractal.js.git"
   },
   "scripts": {
     "build": "./node_modules/webpack/bin/webpack.js --config webpack.config.js --env production",